FastModel: enable kvstore

Author: Qinghao Shi

features/storage/kvstore/conf/tdb_internal/mbed_lib.json

@@ -22,6 +22,10 @@
        "ARM_MUSCA_A1_S": {
             "internal_size": "0x8000",
             "internal_base_address": "0x00420000"
+        },
+        "FVP_MPS2": {
+            "internal_size": "0x200000",
+            "internal_base_address": "0x00200000"
         }
     }
 }